交叉表行列转换

You can simulate a CROSSTAB by the following method:-

Use IF function to select the key value of the sub table as in:

SELECT 
SUM(IF(beta_idx=1, beta_value,0)) as beta1_value,
SUM(IF(beta_idx=2, beta_value,0)) as beta2_value,
SUM(IF(beta_idx=3, beta_value,0)) as beta3_value
FROM alpha JOIN beta WHERE alpha_id = beta_alpha_id;

where alpha table has the form alpha_id, alpha_blah, alpha_blah_blah
and beta table has the form beta_alpha_id, beta_other stuff,
beta_idx, beta_value

This will create 3 columns with totals of beta values according to their idx field